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November 22, 2024

According to Decree 280-2024 published on February 28, 2024, in the Gazette officielle du Québec, the amendment to the Appendix 1 of the Regulation respecting occupational health and safety (RSST, RLRQ, c. S-2.1, r. 13) will come into force on March 14, 2024. These regulatory changes have not yet been incorporated into the current Substance Data Sheets of the Sampling Guide for Air Contaminants in the Workplace. An update is currently underway and will be available as soon as possible. Consequently, the information contained in the data sheets of substances modified or added in Decree 280-2024 is partially inaccurate or incomplete. Please consult our infoLABO (in French only) for more details. Please contact our client service: [email protected] for further information.

Fibres, Natural Mineral Fibres, Attapulgite  

French name in the regulation: Fibres minérales naturelles Attapulgite
CAS : 12174-11-7

Exposure Standards in RROHS regulation

Permissible exposure values (PEV)
ppm mg/m3 f/cc Notes
TWAEV - - 1 4
STEV - - - -
Ceiling - - - -
Carcinogenicity C1 Sensitizer
Simple asphyxiantPercutaneous
Prohibited useProhibited recirculation
Minimum exposure Explosion hazard
Ototoxic

TWA adjustment for unusual work schedules

III : Weekly adjustment

CNESST – Toxicological Index Service

Consult REPTOX file: Fibres, Natural Mineral Fibres, Attapulgite

Analysis:

Numération de fibres

Method: IRSST - 243

Sampling protocol

Sampling device:
Sampling media required:
#IRSSTDescription
918 Cassette with conductive extension and MCE, 25 mm, 0.8 µm

Parameters:
Flow rate: 0,5-16 L/min
TWA sampling volume: 400 L
STEL sampling volume: -
Remarks: Open cassette sampling. A flow rate not exceeding 2.5 L/min is recommended to determine an average concentration. Supply at least 2 blanks per series of samples or 10% of sample total, whichever is highest. Send the samples in a cardboard box supplied by the IRSST (#3010). In relatively clean atmospheres, where the fiber concentration is less than 0.1 fibres/mL, use larger sampling volumes (3000 to 10000L) to obtain quantifiable densities.

Principle: Phase contrast optical microscopy (PCM)
Remarks: The method applies to the counting of all fibres whose refractive index is compatible with the mounting solution. The minimum reported value is 9 fibres/mm². Characterization of the fibres in bulk samples or in deposited dusts is done using method 244. An analysis using a transmission electron microscopy (TEM) method may be required for some materials containing fine asbestos fibres, for example floor tiles.

IRSST. "Numération des fibres". Méthode 243. Méthodes analytiques. Montréal: IRSST, 2022.